3 August 1998
water discharges, in the vicinity of the water supply intake. For supplies derived from
impounding reservoirs, it is generally feasible to establish and maintain a control and
surveillance program whose objective is protection of the quality of raw water obtained from
the reservoir. At reservoirs whose sole purpose is to provide a source of water supply,
recreational use of the reservoir and shoreline areas should be rigorously controlled to protect
the water supply quality.
6-5. CHECKLIST FOR SURFACE WATER INVESTIGATIONS. The investigations will cover
the following items, as well as others, as circumstances warrant.
a. Topographic maps showing pertinent drainage areas.
b. Hydrologic data, as required for project evaluations; e.g., rainfall, runoff,
evaporation, assessment of ground water resources and their potential as the sole source or
supplementary source of supply.
d. Intake location.
e. Water quality data at or near proposed intake site.
f. Feasibility of developing supply without reservoir construction.
g. Reservoir location if reservoir is required.
h. Plans for other reservoirs on watershed.
i. Pertinent geological data that may affect dam foundation or ability of reservoir to hold
j. Locations for pumping stations, supply lines, treatment plant.
k. Energy requirements for proposed system.
l. State water laws, rules and regulations, procedure for obtaining right to use water,
impact of proposed use on rights of other users.
m. Disposition of water supply sludge from treatment plant.
6-6. TREATMENT REQUIREMENTS. Surface water sources must meet specific contaminant
level requirements given in 40 CFR 141, Subpart H for fecal coliform and turbidity, or provide
filtration. In most case, filtration should be anticipated. Disinfection must be provided for all
surface water sources of potable water. Additional treatment may be required to remove other